Industrial development exists gradient difference in nine provinces of Pan-Pearl River Delta area.It can be classified as four types by cluster analysis.Omissions five regional resource-based or a higher degree of monopoly in the industry，Guangdong Province has 17 industries，which industrial gradient coefficient greater than 1.When nine provinces are considered as a product of the closed system sold，and these 17 industries are chosesed as a sample，we calculate industry indicators inter-regional links in nine provinces，and verify the relevance.We find that there are 14 exported industrial products in Guangdong Province，and the main output place is likely to Fujian，Guizhou and Sichuan provinces.